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Email Subject Line & Spam Checker (free)

Score your subject line and email for spam triggers before you send.

Use it nowHow it works

Free, no sign-up.

How to use it

3 steps, under a minute.

  1. 1Paste subject + body

    Add your subject line and, optionally, the email body.

  2. 2Read the score

    See your 0–100 spam score, grade and each flagged issue.

  3. 3Fix and re-check

    Rewrite the flagged phrases and watch the score drop.

The short answer.

The email spam checker scores your subject line and body from 0 (clean) to 100 (spammy) using rule-based checks: spam trigger words, ALL-CAPS, excessive punctuation and emoji, subject length, link-heavy copy and missing unsubscribe text. It highlights each issue so you can fix it and protect your sender reputation.

What actually lands you in spam

Content is only one part of deliverability. Authentication (SPF, DKIM, DMARC), sender reputation, list hygiene and engagement matter even more. But spammy content is the easiest thing to fix: urgency pressure, “100% free” claims, money-making language, shouty capitals and a wall of links all raise red flags with filters and readers alike.

Subject line sweet spot

Aim for about 30–50 characters and 4–9 words, at most one emoji, and a clear reason to open. Personalisation (the first name or city) helps. Test two subject lines against each other instead of guessing.

Questions

Email Subject Line & Spam Checker, answered.

Does a low score guarantee inbox delivery?

No. It's a directional content check. Deliverability also depends on SPF/DKIM/DMARC, reputation and list quality.

Is my email stored?

No. The checker runs entirely in your browser.

Are emojis bad in subject lines?

One relevant emoji is fine and can lift opens. Several emojis in a row look spammy.

What is a good score?

Under 20 is great and 20–40 is good. Above 40, rewrite before sending.

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